21104340262 has 4 divisors (see below), whose sum is σ = 31656510396. Its totient is φ = 10552170130.

The previous prime is 21104340167. The next prime is 21104340263. The reversal of 21104340262 is 26204340112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104340263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5276085064 + ... + 5276085067.

It is an arithmetic number, because the mean of its divisors is an integer number (7914127599).

Almost surely, 2^21104340262 is an apocalyptic number.

21104340262 is a deficient number, since it is larger than the sum of its proper divisors (10552170134).

21104340262 is a wasteful number, since it uses less digits than its factorization.

21104340262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10552170133.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21104340262 its reverse (26204340112), we get a palindrome (47308680374).

The spelling of 21104340262 in words is "twenty-one billion, one hundred four million, three hundred forty thousand, two hundred sixty-two".